Vodacom not cancelling my expired contract after numerous cancellation requests?

Pathetic service from Vodacom's accounts department yet again!

My 24-month LTE contract with Vodacom expired on the 8th of January 2021. I phoned Vodacom on the 4th of December 2020 to make sure my contract will be cancelled in January 2021. I even received a confirmation sms that my contract will be cancelled.

It is now March 2021 and this contract is still active and I am still being billed for a contract that I specifically cancelled well in time? I have reported this now 5 times and every time I get the same reply from the retention department operator "we can see you cancelled on the 4th December 2020, we will escalate this matter."

Absolute useless comment as obviously nothing happens after this?

Come on Vodacom, how difficult can this be?